The following telephone companies are the largest phone companies in India. Most, if not all, provide landline phone service in the Delhi area. In some cases, landline home phones are provided via wireless local loop (WLL) rather than normal fixed line service. Please check their websites for coverage and service details.

Bharti Airtel - Bharti Airtel is an integrated carrier with growing presence across all of India's 23 telecom circles. The company provides landline and mobile services in 94 cities, including Delhi, and has the largest mobile subscriber base.

BSNL - Government-owned Bharat Sanchar Nigam Limited (BSNL) is the largest and oldest telephone operator in India. It provides both landline and mobile phone service nationwide, except for Delhi and Mumbai where MTNL operates (see below). Until the late 1990s, it had a monopoly on telecom services and is still the largest phone company in the country. BSNL corporate home page

MTNL Delhi - Government-owned Mahanagar Telephone Nigam Limited (MTNL) provides landline, mobile phone, and internet services in Delhi and Mumbai. It is the sister organization to BSNL and is a major incumbent telephone operator in India. MTNL corporate home page

Infotel Connect - HFCL Infotel Connect is a smaller telephone company started in 2000. Currently, they serve only Punjab - they do not currently provide service in Delhi. In Punjab, the company provides landline, mobile, and internet services.

Reliance Communications - Reliance Communications has grown rapidly throughout India since launching in 2002. The company provides both landline and mobile services in Delhi.

Tata Indicom - Tata Indicom provides both landline and mobile services in Delhi. The company has grown rapidly since launching in 1996 and especially since the acquisition of Hughes Telecom in 2002.

The following companies are the largest mobile phone providers in India. Most, if not all, provide GSM or CDMA mobile phone service in the Delhi / notapplicable area. Please check their websites for coverage and service details.

Aircel (GSM) - Aircel is a growing mobile provider which currently provides service in several telecom circles, but not Delhi. As of mid-2008, the company had also obtained rights to operate in additional circles, including Delhi (Metro), Mumbai (Metro), Andhra Pradesh, Gujarat, Haryana, Karnataka, Kerala, Madhya Pradesh, Maharashtra & Goa, Rajasthan, Punjab, UP (West) and UP (East).

Bharti Airtel (GSM) - Bharti Airtel has become India's largest mobile telephone company and has the only truly national network. It provides services in all of India's 23 telecom circles. Airtel provides GSM mobile services.

BPL Mobile (GSM) - BPL Mobile is a smaller mobile carrier that currently provides service only in Mumbai (Metro) circle. It does not currently serve Delhi.

BSNL (GSM) - Government-owned BSNL, India's largest phone company, does not provide mobile service in Delhi. See instead MTNL below.

Reliance Communications (CDMA) - Reliance Mobile operates a CDMA network in NCT of Delhi and elsewhere in India. The company's mobile operations have grown rapidly throughout India since launching in 2002.

Spice Communications (GSM) - Spice India is a smaller mobile player with operations so far only in Karnataka and Punjab. The company does not serve Delhi. The company serves about 3 Million customers over a GSM network. Spice, which is listed on the Bombay exchange, is a joint venture between Modi Wellvest and Telekom Malaysia.

Tata Indicom (CDMA) - Tata Indicom provides CDMA mobile services in Delhi and 1,000 other cities across India. The company has grown rapidly throughout India since launching in 1996 and especially since the acquisition of Hughes Telecom in 2002.

Vodafone India (GSM) - Vodafone India provides GSM mobile services in Delhi and elsewhere. The company acquired Hutchinson Telecom in 2007 to accelerate growth. In the same year, it also acquired additional GSM mobile licenses.